TRANSRADIO SENDERSYSTEME BERLIN AHL 0447

The horizontally polarized Log Periodic Directional Antenna AHL 0447 is intended for fixed communication over small to large distances.

Coverage of small to medium distances is achieved using a version with a steep firing angle specially designed for low frequencies with a reduced mast height and lower height above ground.

For the case where propagation via sky waves over large distances is essential, a version with increased mast height with a flatter firing angle for higher frequencies is available.

The antennas are designed and fabricated with quality assurance uppermost. The basis for mechanical loading calculations is DIN 4131 and higher load factors can be accommodated on request. The choice of materials is based on long term experience gained in the field of corrosion and statics. For example, HF conducting parts such as dipoles and feed lines are fabricated from sea-water resistant aluminium or aluminium alloys, the smallest fan antenna also makes use of fine stranded bronze rope. Fixtures and standard parts are made from stainless steel. Guy ropes are fabricated either from stainless steel or Parafil. All insulators are made from glazed low-loss ceramic. The masts are constructed from hot-dip galvanized steel.